CN109958417B - Fracturing sand control pipe column and method - Google Patents
Fracturing sand control pipe column and method Download PDFInfo
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- CN109958417B CN109958417B CN201711428032.1A CN201711428032A CN109958417B CN 109958417 B CN109958417 B CN 109958417B CN 201711428032 A CN201711428032 A CN 201711428032A CN 109958417 B CN109958417 B CN 109958417B
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- 239000004576 sand Substances 0.000 title claims abstract description 210
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000012530 fluid Substances 0.000 claims description 18
- 230000002265 prevention Effects 0.000 claims description 13
- 230000007246 mechanism Effects 0.000 claims description 9
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 230000010354 integration Effects 0.000 abstract description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 175
- 230000000694 effects Effects 0.000 description 19
- 239000003129 oil well Substances 0.000 description 18
- 230000008569 process Effects 0.000 description 14
- 238000004519 manufacturing process Methods 0.000 description 13
- 238000003825 pressing Methods 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000002457 bidirectional effect Effects 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000002572 peristaltic effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/08—Screens or liners
- E21B43/086—Screens with preformed openings, e.g. slotted liners
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Earth Drilling (AREA)
- Pipe Accessories (AREA)
Abstract
The invention provides a fracturing sand control pipe column and a fracturing sand control method, wherein the fracturing sand control pipe column comprises a sleeve and an oil pipe arranged in the sleeve, an annular space is formed between the sleeve and the oil pipe, a fracturing packer is arranged on the oil pipe, a ball seat and a sand control screen pipe are sleeved in the bottom end of the oil pipe, the ball seat is in threaded connection with the upper part of the sand control screen pipe, the bottom end of the oil pipe is connected with a limiting device, the limiting device is positioned below the sand control screen pipe, and the length of the sand control screen pipe is 20-30 meters greater than the thickness of a reservoir; the top end of the sand control screen tube is provided with a female buckle, and a limiting groove is arranged in the limiting device; when the soluble ball is thrown into the ball seat to strike the ball seat, the ball seat drives the sand control screen to move downwards until the female buckle is clamped in the limiting groove; and (5) standing for 48 hours after the sand control screen is in place, and dissolving the soluble balls. The fracturing sand control pipe column provided by the invention can ensure that stratum sand and fracturing sand are not returned under the condition of no secondary well completion, and realizes the integration of fracturing and sand control.
Description
Technical Field
The invention relates to the technical field of exploitation and completion of oil and gas wells in oil fields, in particular to a fracturing sand prevention pipe column and a fracturing sand prevention method.
Background
In the field of oil exploitation, especially for the exploitation of heterogeneous cemented loose sandstone oil reservoirs, the cooperation of fracturing operation is often required to form deep-penetrating and high-conductivity cracks in the oil reservoir so as to improve the oil well yield. Meanwhile, sand production of an oil well is a common problem in the exploitation process of a loose sandstone oil reservoir, and the sand production can cause a series of hazards such as sand burying oil layer, equipment corrosion, well wall collapse and the like, so that the productivity and the yield of the oil well are directly affected.
In the prior art, a large amount of quartz sand or ceramsite is filled in a stratum during fracturing, and a sand control screen pipe is put into the stratum after fracturing by performing secondary well completion so as to play a role in sand control. However, the problem of return discharge of fracturing sand often exists when the fracturing fluid is returned after fracturing in the prior art, so that not only is the sand filling effect poor, but also a plurality of difficulties are brought to later sand flushing. Meanwhile, because the heterogeneous loose sandstone has a sand outlet phenomenon, after fracturing, the sand screen is directly put into the well completion for the second time, the bottom pressure is lower than the stratum pressure due to repeated running operation, the stratum well wall collapses, and the screen cannot be put into a designated position, so that the sand control effect cannot be achieved.
Disclosure of Invention
The invention provides a fracturing sand control pipe column and a fracturing sand control method, which can ensure that stratum sand and fracturing sand are not returned under the condition of no secondary well completion, and realize the integration of fracturing and sand control.
The invention provides a fracturing sand control column, which comprises a sleeve and an oil pipe arranged in the sleeve, wherein an annular space is formed between the sleeve and the oil pipe, a fracturing packer is arranged on the oil pipe,
The ball seat and the sand control screen are sleeved in the bottom end of the oil pipe, the ball seat is in threaded connection with the upper part of the sand control screen, the bottom end of the oil pipe is connected with a limiting device, the limiting device is positioned below the sand control screen, and the length of the sand control screen is 20-30 meters greater than the thickness of the reservoir;
a female buckle is arranged at the top end of the sand control screen pipe, and a limiting groove is arranged in the limiting device;
When a soluble ball is thrown into the ball seat to strike the ball seat, the ball seat drives the sand control screen to move downwards until the female buckle is clamped in the limiting groove; and standing for 48 hours after the sand control screen is in place, and dissolving the soluble balls.
The fracturing sand control pipe column provided by the embodiment of the invention ensures that stratum sand and fracturing sand are not returned by stratum while the fracturing effect is taken into account, and can realize the integration of fracturing and sand control. Because the operation procedure of putting the sand control pipe column into the secondary well completion is reduced, the well completion cost is reduced, and the problem of formation well wall collapse caused by repeated lifting operation of the secondary well completion is avoided. In the process of fracturing fluid flowback, the sand control screen pipe which completely covers the reservoir prevents sand which enters the stratum from flowing back, the sand control effect is ensured, meanwhile, the overflow area of the oil well is increased, and the production capacity of the oil well is improved.
As described above, the limiting device is in threaded connection with the oil pipe.
As described above, the bottom end of the sand control screen pipe is also provided with the pipe shoe, the bottom of the side wall of the pipe shoe is provided with the inclined surface extending downwards, and the inclined surface is abutted with the limiting device.
As described above, the outer diameter of the pipe shoe is larger than the inner diameter of the limiting device, and the outer diameter of the sand control screen is not smaller than the inner diameter of the limiting device.
As described above, the fracturing sand control pipe column is provided with the releasing mechanism inside the fracturing packer, and the releasing mechanism is of an insertion pipe stab buckle or a conventional back buckle structure.
As described above, the fracturing packer is of a two-way slip structure and comprises an upper slip and a lower slip.
As described above, the female buckle is a buckle body formed by outwards turning the top end of the sand control screen.
The fracturing sand control pipe column is characterized in that the sand control screen pipe is a slotted screen pipe.
As described above, the tubing is disposed within the casing by a tubing hanger at the top.
The fracturing sand control pipe column provided by the embodiment of the invention ensures that stratum sand and fracturing sand are not returned by stratum while the fracturing effect is taken into account, and can realize the integration of fracturing and sand control. Because the operation procedure of putting the sand control pipe column into the secondary well completion is reduced, the well completion cost is reduced, and the problem of formation well wall collapse caused by repeated lifting operation of the secondary well completion is avoided. In the process of fracturing fluid flowback, the sand control screen pipe which completely covers the reservoir prevents sand which enters the stratum from flowing back, the sand control effect is ensured, meanwhile, the overflow area of the oil well is increased, and the production capacity of the oil well is improved. The sand control screen pipe has the sand control function through ball throwing and pressing operation, and is simple and reliable in operation and easy to control.
In another aspect, the present invention provides a method for fracturing sand control, applied to a fracturing sand control string as described above, the method comprising:
The fracturing sand prevention pipe column is put into a reservoir, the fracturing packer is set, and fracturing sand filling operation is carried out;
After the fracturing sand filling operation is completed, a soluble ball is thrown into the oil pipe, and the oil pipe is pressed, so that the ball seat drives the sand control screen pipe to move downwards until the female buckle is clamped in the limiting groove, and the sand control screen pipe reaches a target position;
Standing for 48 hours after the sand control screen is in place, and dissolving the soluble balls;
The fracturing fluid is returned to the ground through the oil pipe;
And releasing the fracturing packer through the releasing mechanism, and separating the tubular column at the upper part of the fracturing packer.
The fracturing sand prevention method provided by the embodiment of the invention ensures that stratum sand and fracturing sand are not returned by stratum while the fracturing effect is taken into account, and can realize the integration of fracturing and sand prevention. Because the operation procedure of putting the sand control pipe column into the secondary well completion is reduced, the well completion cost is reduced, and the problem of formation well wall collapse caused by repeated lifting operation of the secondary well completion is avoided. In the process of fracturing fluid flowback, the sand control screen pipe which completely covers the reservoir prevents sand which enters the stratum from flowing back, the sand control effect is ensured, meanwhile, the overflow area of the oil well is increased, and the production capacity of the oil well is improved. The sand control screen pipe has the sand control function through ball throwing and pressing operation, and is simple and reliable in operation and easy to control.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are some embodiments of the invention and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the overall structure of a fracturing sand control string provided by an embodiment of the invention before operation;
FIG. 2 is a schematic diagram of the overall structure of a fracturing sand control string according to an embodiment of the present invention after operation;
FIG. 3 is a partial, semi-sectional view of a bottom end of a fracturing sand control string provided by an embodiment of the present invention prior to operation;
FIG. 4 is a partial bottom half cross-sectional view of a fracturing sand control string provided by an embodiment of the present invention after operation;
FIG. 5 is a flowchart of a method for controlling sand by fracturing according to an embodiment of the present invention.
Reference numerals:
1-a sleeve;
11-tubing hanger;
2-an oil pipe;
3-fracturing a packer;
31-upper slips of the packer;
32-packer lower slips;
4-sand control screen pipe;
41-a female buckle;
5-ball seat;
6-a limiting device;
61-a limit groove;
7-tube shoes.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "top", "bottom", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", "axial", "circumferential", etc. are used to indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the referred location or element must have a specific orientation, in a specific configuration and operation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly attached, detachably attached, or integrally formed; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can lead the interior of two elements to be communicated or lead the two elements to be in interaction relationship. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The invention is described below in connection with specific embodiments with reference to the accompanying drawings.
In this embodiment, fig. 1 is a schematic diagram of an overall structure of a fracturing sand control string provided by the embodiment of the present invention before operation, fig. 2 is a schematic diagram of an overall structure of a fracturing sand control string provided by the embodiment of the present invention after operation, fig. 3 is a partial semi-sectional view of a bottom end of the fracturing sand control string provided by the embodiment of the present invention before operation, and fig. 4 is a partial semi-sectional view of a bottom end of the fracturing sand control string provided by the embodiment of the present invention after operation.
Referring to fig. 1 and 2, the fracturing sand control string comprises a sleeve 1 and an oil pipe 2 arranged in the sleeve 1, an annular space is formed between the sleeve 1 and the oil pipe 2, and a fracturing packer 3 is arranged on the oil pipe 2; the ball seat 5 and the sand control screen 4 are sleeved in the bottom end of the oil pipe 2, the ball seat 5 is connected to the upper part of the sand control screen 4 in a threaded manner, the bottom end of the oil pipe 2 is connected with the limiting device 6, the limiting device 6 is positioned below the sand control screen 4, and the length of the sand control screen 4 is 20-30 meters greater than the thickness of the reservoir; the top end of the sand control screen 4 is provided with a female buckle 41, and a limiting groove 61 is arranged in the limiting device 6; when soluble balls are thrown into the ball seat 5, the ball seat 5 drives the sand control screen 4 to move downwards until the female buckle 41 is clamped in the limit groove 61; after sand control screen 41 is in place, it is left to stand for 48 hours, and the soluble balls dissolve.
The working process of the fracturing sand control pipe column provided by the embodiment is that firstly, the fracturing sand control pipe column is put into a well, the fracturing packer 3 is set, the fracturing operation is carried out, and in the fracturing process, propping agent, namely fracturing sand, is injected into a stratum along with fracturing fluid; after the fracturing sand filling work is completed, soluble balls are put into the oil pipe 2, the ball seat 5 drives the sand control screen 4 to move downwards until the female buckle 41 at the top end of the sand control screen 4 is clamped on the limiting groove 61 of the limiting device 6; standing for 48 hours after the sand control screen 4 is in place, and completely dissolving the soluble balls; the fracturing fluid is returned to the wellhead under the action of pressure difference; after the flowback is finished, the fracturing packer 3 is released, the pipe column at the upper part of the fracturing packer 3 is separated, and normal production pipe column running-in can be performed.
After the ball throwing operation, the limiting groove 61 of the limiting device 6 is clamped with the female buckle 41 at the top end of the sand control screen 4, and the limiting device 6 plays a role in limiting the position of the sand control screen 4. Alternatively, the structure of the stopper 6 may be set with reference to the structure of a usual landing nipple. The shape of the female buckle 41 and the shape of the limiting groove 61 are matched. The cross-sectional shapes of the female buckle 41 and the limit groove 61 may be rectangular, right trapezoid or isosceles trapezoid. When the cross-sectional shape is trapezoidal, the female buckle 41 is more easily engaged with the limit groove 61.
In this embodiment, the depth and thickness of the reservoir are known when drilling, the sand control screen 4 needs to be lowered into the reservoir, the length of the sand control screen 4 is 20 to 30 meters greater than the thickness of the reservoir, the length of the sand control screen 4 is longer than the thickness of the reservoir, the sand control screen 4 is ensured to completely cover the reservoir after ball injection operation, so that the overflow area of the oil well is increased, the production capacity of the oil well is improved, and the sand control effect of the sand control screen 4 in the fracturing fluid flowback process is ensured.
The fracturing sand prevention pipe column provided by the embodiment of the invention ensures that stratum sand and fracturing sand are not returned by stratum while the fracturing effect is taken into account, and can realize the integration of fracturing and sand prevention; the operation procedure of putting the sand control pipe column into the secondary well completion is reduced, so that the well completion cost is reduced, and the problem of formation well wall collapse caused by repeated lifting operation of the secondary well completion is avoided; in the process of fracturing fluid flowback, the sand control screen pipe which completely covers the reservoir prevents sand which enters the stratum from flowing back, the sand control effect is ensured, meanwhile, the overflow area of the oil well is increased, and the production capacity of the oil well is improved.
The structure of each component will be described in detail below using specific examples.
In this embodiment, the limiting device 6 is in threaded connection with the oil pipe 2, and the pressure bearing capacity of the threaded connection of the limiting device 6 and the oil pipe 2 is greater than the pressure required by setting and checking the fracturing packer 3. Meanwhile, the pressure bearing capacity of the limiting device 6 in threaded connection with the oil pipe 2 is larger than the pressure applied when the ball seat 5 and the sand control screen 4 fall. And (3) putting soluble balls into the ball seat 5, and pressing the ball seat 5 into the oil pipe 2 in the process of driving the sand control screen 4 to fall to a position completely covering a reservoir stratum, so that the sand control screen 4 smoothly falls to a target position. Therefore, the pressure bearing capacity of the threaded connection of the limiting device 6 and the oil pipe 2 is larger than the pressure applied when the sand control screen 4 and the ball seat 5 fall, so that the connection of the limiting device 6 and the oil pipe 2 is not affected when the ball seat 5 and the sand control screen 4 fall due to pressing.
In this embodiment, the bottom end of the sand control screen 4 is further provided with a shoe 7, and the bottom of the sidewall of the shoe 7 is provided with a downward extending inclined surface, and the inclined surface is abutted with the limiting device 6. Because the external diameter of the tube shoe 7 is larger than the internal diameter of the limiting device 6, the tube shoe 7 moves downwards along with the sand control screen 4 and the ball seat 5 after throwing the ball, and the arrangement of the inclined surface plays a guiding role, so that the tube shoe 7 can be extruded into the limiting device 6 more easily. It should be noted that, the top of the inner wall of the limiting device 6 may be provided with an inclined surface extending outwards, and before the ball throwing operation, the two inclined surfaces are matched and abutted, and the inclined surface of the limiting device 6 plays a role of supporting the shoes 7; after the pitching operation, the mutually matched inclined surfaces enable the shoes 7 to be squeezed into and pass through the limiting device 6 more easily.
Specifically, the inclination angle of the inclined surface of the bottom portion of the side wall of the shoes 7 extending downward may be set to 30 ° to 60 °. The larger the inclination angle is, the more remarkable the guiding effect is, the larger the inclination angle is, and the supporting stability is lowered. Accordingly, the inclination angle is set in the range of 30 ° to 60 °.
In this embodiment, the outer diameter of the shoes 7 is larger than the inner diameter of the limiting device 6, and the outer diameter of the sand control screen 4 is not smaller than the inner diameter of the limiting device 6. Specifically, the minimum diameter of the stopper 6 due to the provision of the stopper groove 61 is defined as the inner diameter of the stopper 6, and the outer diameter of the shoes 7 is larger than the inner diameter of the stopper 6, so that the shoes 7 are supported by the stopper 6 before the pitching operation, and the shoes 7 cannot fall through the inner diameter of the stopper 6. In addition, the outer diameter of the sand control screen 4 is not smaller than the inner diameter of the limiting device 6, the larger the diameter of the sand control screen 4 is, the overflow area of an oil well can be increased, meanwhile, in the process that the ball seat 5 drives the sand control screen 4 to fall down, interference exists between the sand control screen 4 and the inner wall of the limiting device 6, the sand control screen 4 needs to fall down by pressing the inside of the oil pipe 2, and the pressing operation is favorable for controlling the falling position of the sand control screen.
In this embodiment, a releasing mechanism (not shown in the figure) is arranged inside the fracturing packer 3, and the releasing mechanism is an insertion pipe stab button or a conventional back-buckling structure. After completion of the flowback of the fracturing fluid, the fracturing packer 3 is required to be released by a releasing mechanism, the pipe column at the upper part of the fracturing packer 3 is separated, and then the normal production pipe column can be put in.
In the fracturing operation process, the fracturing packer 3 can isolate fluid flow and pressure transmission between the oil pipe 2 and the annular space, and plays roles in protecting the casing 1 and isolating non-fracturing intervals. In this embodiment, the fracturing packer 3 is of a two-way slip structure, and comprises an upper slip 31 and a lower slip 32. The bidirectional slip packer can realize setting and unsetting through the operation modes of rotating a tubular column, pressing down or lifting up, and is simple in operation, flexible and reliable. When the upper slips 31 and the lower slips 32 are expanded to be in abutting contact with the inner wall of the casing 1, the packing element of the fracturing packer 3 is expanded to completely seal the annular space between the fracturing packer 3 and the casing 1, and setting is completed. After setting, the fracturing packer 3 is anchored in a bidirectional slip way, so that the fracturing packer can bear loads in the upper direction and the lower direction, the anchoring is reliable, the upward and downward peristaltic movement of an oil pipe can be effectively overcome, and the oil extraction efficiency is improved.
In this embodiment, the female buckle 41 is a buckle body formed by outwards folding the top end of the sand control screen 4. It should be noted that the shape of the female buckle 41 and the limit groove 61 are matched.
The sand control screen 4 in this embodiment is a slotted screen. The pipe body of the slotted screen pipe is cut with fine slots for blocking stratum sand outside the screen pipe to realize sand prevention, and the slotted screen pipe has simple structure and low cost. The sand control screen 4 may also be another type of screen such as an expansion screen or the like.
In this embodiment, the tubing 2 is placed inside the casing 1 by means of a tubing hanger 11 at the top. Tubing hanger 11 is a device that supports tubing 2 and seals the annular space between tubing 1 and casing 2. The tubing hanger 11 utilizes the gravity of the tubing 2 to realize sealing, is convenient to operate, and is safe and reliable.
The fracturing sand prevention pipe column provided by the embodiment of the invention ensures that stratum sand and fracturing sand are not returned by stratum while the fracturing effect is taken into account, and can realize the integration of fracturing and sand prevention; the operation procedure of putting the sand control pipe column into the secondary well completion is reduced, so that the well completion cost is reduced, and the problem of formation well wall collapse caused by repeated lifting operation of the secondary well completion is avoided; in the process of fracturing fluid flowback, the sand control screen pipe which completely covers the reservoir prevents sand which enters the stratum from flowing back, the sand control effect is ensured, meanwhile, the overflow area of the oil well is increased, and the production capacity of the oil well is improved.
Another embodiment of the present invention provides a fracturing sand control method applied to the fracturing sand control pipe column described above, and fig. 5 is a flowchart of the fracturing sand control method provided by the embodiment of the present invention, and referring to fig. 5, the fracturing sand control method includes:
S101, the fracturing sand control pipe column is put into a reservoir, the fracturing packer is set, and fracturing sand filling operation is carried out;
specifically, the fracturing sand filling operation comprises the steps of injecting fracturing fluid into the oil pipe 2 to enable a bottom stratum to generate cracks, continuously injecting propping agent, namely fracturing sand, into the cracks along with the fracturing fluid, and enabling the propping agent to play a role of supporting the cracks not to be closed due to stress release, so that high diversion capacity is maintained, and oil and gas are unblocked.
S102, after the fracturing sand filling operation is completed, putting a soluble ball into the oil pipe, and pressing the oil pipe so that the ball seat drives the sand control screen pipe to move downwards until the female buckle is clamped in the limiting groove, and the sand control screen pipe reaches a target position;
S103, standing for 48 hours after the sand control screen is in place, and dissolving the soluble balls;
Before the ball throwing operation, the state of the fracturing sand control pipe column is shown in fig. 1 and 3, the sand control screen 4 and the ball seat 5 are lined in the oil pipe 2 and are positioned above the limiting device 6. After ball throwing operation and pressing operation, the state of the fracturing sand control pipe column is shown in fig. 2 and 4, the sand control screen 4 and the ball seat 5 fall down and are positioned below the limiting device 6, and the sand control screen 4 stands for 48 hours after being in place, so that the soluble balls are dissolved. The female buckle 41 at the top end of the sand control screen 4 is clamped with the limiting groove 61 of the limiting device 6, and the limiting device 6 not only limits the falling position of the sand control screen 4, but also limits the sand control screen 4 not to move upwards. When the ball seat 5 drives the sand control screen 4 to move downwards, the outer diameters of the sand control screen 4 and the pipe shoe 7 are larger than the inner diameter of the limiting device 6, and pressure needs to be applied, so that the sand control screen 4 and the pipe shoe 7 are extruded into and smoothly extruded through the limiting device 6.
S104, returning the fracturing fluid to the ground through the oil pipe;
Under the effect of pressure difference between inside and outside the well, the fracturing fluid is discharged back to the well head through the oil pipe 2, and in the back discharge process, the sand control screen pipe 4 can not move upwards under the effect of the limiting device 6, so that the effect of preventing the fracturing sand from entering the well shaft is achieved.
S105, releasing the fracturing packer through a releasing mechanism, and separating the tubular column at the upper part of the fracturing packer.
The separation of the oil pipe 2 and the packer 3 can be realized through the insert pipe stab or the conventional back-buckling structure inside the fracturing packer 3, and the pipe column at the upper part of the fracturing packer 3 is separated after releasing, so that the production pipe column of the normal oil-gas well can be put in. The lower sand control screen 4 is left under the well, and the later machine production string needs to be replaced, so that the operation of the sand control screen 4 is not affected.
The fracturing sand prevention method provided by the embodiment of the invention ensures that stratum sand and fracturing sand are not returned by stratum while the fracturing effect is taken into account, and can realize the integration of fracturing and sand prevention. Because the operation procedure of putting the sand control pipe column into the secondary well completion is reduced, the well completion cost is reduced, and the problem of formation well wall collapse caused by repeated lifting operation of the secondary well completion is avoided. In the process of fracturing fluid flowback, the sand control screen pipe which completely covers the reservoir prevents sand which enters the stratum from flowing back, the sand control effect is ensured, meanwhile, the overflow area of the oil well is increased, and the production capacity of the oil well is improved. The sand control screen pipe has the sand control function through ball throwing and pressing operation, and is simple and reliable in operation and easy to control.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (8)
1. The fracturing sand control tubular column comprises a sleeve and an oil pipe arranged in the sleeve, an annular space is formed between the sleeve and the oil pipe, a fracturing packer is arranged on the oil pipe, the fracturing sand control tubular column is characterized in that,
The ball seat and the sand control screen are sleeved in the bottom end of the oil pipe, the ball seat is in threaded connection with the upper part of the sand control screen, the bottom end of the oil pipe is connected with a limiting device, the limiting device is positioned below the sand control screen, and the length of the sand control screen is 20-30 meters greater than the thickness of the reservoir;
a female buckle is arranged at the top end of the sand control screen pipe, and a limiting groove is arranged in the limiting device;
when a soluble ball is thrown into the ball seat to strike the ball seat, the ball seat drives the sand control screen to move downwards until the female buckle is clamped in the limiting groove; standing for 48 hours after the sand control screen is in place, and dissolving the soluble balls;
the limiting device is in threaded connection with the oil pipe;
The fracturing packer is characterized in that a releasing mechanism is arranged in the fracturing packer and is of an insertion pipe stab buckle or a conventional back buckle structure.
2. The pipe column according to claim 1, wherein the bottom end of the sand control screen is further provided with a shoe, the bottom of the sidewall of the shoe is provided with a downward extending inclined surface, and the inclined surface is abutted with the limiting device.
3. The pipe string of claim 2, wherein the outer diameter of the shoes is greater than the inner diameter of the spacing device and the outer diameter of the sand control screen is no less than the inner diameter of the spacing device.
4. The tubing string of claim 1, wherein the fracturing packer is a bi-directional slip configuration comprising an upper slip and a lower slip.
5. The pipe column according to claim 1, wherein the female buckle is a buckle body formed by outwards turning the top end of the sand control screen.
6. The pipe string of claim 1, wherein the sand control screen is a slotted screen.
7. The tubing string of claim 1, wherein the tubing is disposed within the casing by a top tubing hanger.
8. A method of fracturing sand control, applied to the fracturing sand control string of any of claims 1 to 7, comprising:
The fracturing sand prevention pipe column is put into a reservoir, the fracturing packer is set, and fracturing sand filling operation is carried out;
After the fracturing sand filling operation is completed, a soluble ball is thrown into the oil pipe, and the oil pipe is pressed, so that the ball seat drives the sand control screen pipe to move downwards until the female buckle is clamped in the limiting groove, and the sand control screen pipe reaches a target position;
Standing for 48 hours after the sand control screen is in place, and dissolving the soluble balls;
The fracturing fluid is returned to the ground through the oil pipe;
And releasing the fracturing packer through the releasing mechanism, and separating the tubular column at the upper part of the fracturing packer.
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| CN201711428032.1A CN109958417B (en) | 2017-12-26 | 2017-12-26 | Fracturing sand control pipe column and method |
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| CN201711428032.1A CN109958417B (en) | 2017-12-26 | 2017-12-26 | Fracturing sand control pipe column and method |
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| CN109958417A CN109958417A (en) | 2019-07-02 |
| CN109958417B true CN109958417B (en) | 2024-05-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111088973B (en) * | 2020-01-10 | 2023-07-07 | 新疆恒智伟业石油工程技术开发有限公司 | Multifunctional fracturing completion pipe string and process for high-temperature high-pressure oil-gas well |
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| US6962203B2 (en) * | 2003-03-24 | 2005-11-08 | Owen Oil Tools Lp | One trip completion process |
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